Если бы мы были временами года

Born on the same day and raised side by side, high school students Yoon Hae Rim and Uhm Ki Seok are close friends. They never say it, but they are precious to each other. One day, a transfer student from Seoul comes. Oh Dong Kyung is bold and not afraid to say what he is feeling, unlike Hae Rim and Ki Seok. Is Dong Keung enough to shake up their friendship?